Abstract

Abstract New high-sensitive visually controlled membrane-type analytical methods are proposed for quantitation of nicotineamide adenine dinucleotide and alkaline phosphatase in water solutions. The methods are based on using nitrocellulose membrane as a solid matrix on which the components of one-enzyme cofactor regeneration system are being immobilised by adsorption. In the presence of substances to be assayed, the end colored product is being adsorbed on the matrix as a result of enzymatic cyclic NAD/NADH regeneration in the active site of the matrix-bound alcohol dehydrogenase and some chemical successive reactions. Its colored intensity is a measure of the concentration of the analysed substances in solution. The general principle of NAD or alkaline phosphatase determination is successive immobilisation of separate components of the system (N-(6′-aminohexyl)salicylamide and horse liver alcohol dehydrogenase) on the matrix by adding their solutions to the wells of a specially designed cell with the mem...

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